Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
UTILITY ENCLOSURE APRON
CROSS REFERENCE TO RELATED APPLICATIONS
[0001j The present application is based on and claims benefit from co-pending
U.S.
Provisional Application Serial No. 62/340,935 filed May 24, 2016 entitled
"Utility Enclosure
Apron".
BACKGROUND
Field
[00021 The present disclosure relates generally to aprons for utility
enclosures and, more
particularly, to precast aprons for buried utility enclosures that have an
angled top surface to
direct water, ice and debris away from the center of the apron and to limit
damage to the apron
and utility enclosure from impacts.
Description of the Related Art
[00031 Utility companies, such as water, electric, gas, and/or cable
television utilities often use
subterranean conduits and enclosures to deliver their product to customers.
For example,
electrical utilities mu electrical wires through underground conduits and
provide workman
access to such wires using buried utility enclosures that have covers at or
slightly above grade.
The utility enclosures can be buried in the ground, or under roads or
sidewalks. The tops of
buried enclosures when installed can often be subject to impact from
equipment, such as lawn
mowers. Replacing damaged enclosures is expensive. To protect buried utility
enclosures from
impact damage, workmen installing the underground enclosures often dig a
trench or form
around the top of the enclosure and pour a concrete platform that surrounds
the enclosure and is
flush with the top of the enclosure. However, returning to the worksite
multiple times to dig a
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trench around the enclosure, pour the concrete, allow the concrete to set,
remove safety cones
and other equipment after the concrete sets, and to clean the overall worksite
by leveling the
grade and seeding bare soil, if necessary, takes time and increases the cost
to install each
underground utility enclosure.
SUMMARY
[0004] The present disclosure provides embodiments of utility enclosure
aprons. In one
exemplary embodiment, the utility enclosure apron includes a looped member
having a top
surface, a bottom surface, an outer edge between the top surface and the
bottom surface, a center
opening and an inner edge between the top surface and the bottom surface
around the center
opening. The top surface is a tapered surface such that a thickness of the
inner edge is greater
than a thickness of the outer edge.
[0005] The present disclosure also provides embodiments of utility enclosure
kits. In one
exemplary embodiment, the utility enclosure kit includes a utility enclosure
configured for
underground installation, and a utility enclosure apron configured to be
positioned to surround a
top surface of the utility enclosure. The utility enclosure apron includes a
looped member having
a top surface, a bottom surface, an outer edge between the top surface and the
bottom surface, a
center opening and an inner edge between the top surface and the bottom
surface around the
center opening. The top surface is a tapered surface such that a thickness of
the inner edge is
greater than a thickness of the outer edge. The center opening is configured
to fit around a top
portion of the utility enclosure.
[0006] The present disclosure provides embodiments of molds for fabricating
utility enclosure
aprons. In one exemplary embodiment, the mold includes a tub and a frame. The
tub includes a
support member, a center rib and a recess. The support member has a ledge that
extends around
a perimeter of the support member and rests on the frame. The support member
also includes a
wall used to fonn an outer edge of a utility enclosure apron. The center rib
is used to form a
2
hollow center of the utility enclosure apron and includes a wall used to form
an inner edge of
the utility enclosure apron. The recess is located between the support member
and the center
rib. The recess has a face used to form a top surface of the utility enclosure
apron, the face
is tapered so that a width of the recess is at its greatest at the wall of the
center rib and so that
a width of the recess is narrower at the wall of the support member.
[0006A] In a broad aspect, the present invention pertains to a utility
enclosure apron
comprising a looped member formed of a concrete material. The looped member
has a top
surface, a bottom surface, an outer edge between the top surface and the
bottom surface, a
center opening and an inner edge between the top surface and the bottom
surface around the
center opening. There is at least one filler material formed of lightweight
foam encased
within the looped member such that the at least one filler member is
surrounded on all sides
by the concrete material.
10006B11 In a further aspect, the present invention provides a utility
enclosure kit
comprising a utility enclosure configured for underground installation, and a
utility
enclosure apron configured to be positioned to surround a top surface of the
utility enclosure.
The apron includes a looped member formed of a concrete material, the looped
member
having a top surface, a bottom surface, an outer edge between the top surface
and the bottom
surface, a center opening and an inner edge between the top surface and the
bottom surface
around the center opening, the center opening being configured to fit around a
top portion of
the utility enclosure. At least one filler member is formed of lightweight
foam encased
within the looped member so that the at least one filler member is surrounded
on all sides by
the concrete material.
[0006C] In a still further aspect, the present invention provides a
utility enclosure
apron comprising a looped member configured to be mounted around a perimeter
of a utility
enclosure and having a lightweight material encased within a concrete material
such that the
lightweight material is surrounded on all sides by the concrete material. The
looped member
has a top surface, a bottom surface, and an outer edge between the top surface
and the
bottom surface, a center opening and an inner edge between the top surface and
the bottom
surface around the center opening_
2a
Date Recue/Date Received 2022-01-20
10006D1 in a yet further aspect, the present invention sets forth a
utility enclosure
apron comprising a looped member having a lightweight filler material encased
within
polymer concrete reinforced with fiberglass so that the lightweight filler
material is
surrounded on all sides by the polymer concrete reinforced with fiberglass,
the looped
member having a top surface, a bottom surface, an outer edge between the top
surface and
the bottom surface, a center opening and an inner edge between the top surface
and the
bottom surface around the center opening, the top surface being tapered from
the inner edge
to the outer edge_
BRIEF DESCRIPTON OF THE DRAWINGS
[0007] A more complete appreciation of the present disclosure and many of the
attendant
advantages thereof will be readily obtained as the same becomes better
understood by
reference to the following detailed description when considered in connection
with the
accompanying drawings, wherein:
[0008] Fig. 1 is a top perspective view of an exemplary embodiment of a
precast utility
enclosure apron according to the present disclosure positioned around a
utility enclosure
buried in the ground;
[0009] Fig. 2 is a top perspective view with part of the soil removed to
reveal a cross-sectin
of the utility enclosure apron of Fig_ 1;
[0010] Fig. 3 is a side elevational view of the utility enclosure apron of
Fig. 1;
[0011] Fig. 4 is a top perspective view of the utility enclosure apron on Fig.
1, illustrating a
skid resistant surface formed as part of a top surface of the utility
enclosure apron;
[0012] fig. 5 is a bottom plan view of the utility enclosure apron of Fig. 4;
[0013] Fig. 6 is a bottom plan view of another exemplary embodiment of the
utility
enclosure apron according to the present disclosure;
[0014] Fig. 7 is a cross-sectional view of the utility enclosure apron of Fig.
6 taken along
line 7-7;
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[0015] Fig. 8 is a cross-sectional view of the utility enclosure apron of Fig
6 taken along line
8-8;
[0016] Fig. 9 is a top perspective view of another exemplary embodiment of a
precast utility
enclosure apron according to the present disclosure positioned around a
utility enclosure buried
in the ground;
[0017] Fig. 10 is a top perspective view with part of the soil removed to
reveal a cross-section
of the utility enclosure apron of Fig. 9;
[0018] Fig. 11 is a side elevation view of the utility enclosure apron of Fig.
9;
[0019] Fig. 12 is a top perspective view of the utility enclosure apron of
Fig. 9, illustrating a
skid resistant surface formed as part of a top surface of the utility
enclosure apron;
[0020] Fig. 13 is a bottom plan view of the utility enclosure apron of Fig. 9;
[0021] Fig. 14 is a top plan view of the utility enclosure apron of Fig. 9;
[0022] Fig. 15 is a cross-sectional view of the utility enclosure apron of
Fig. 14 taken along
line 15-15;
[0023] Fig. 16 is a cross-sectional view of the utility enclosure apron of
Fig. 14 taken along
line 16-16;
[0024] Fig. 17 is a top perspective view of another exemplary embodiment of a
precast utility
enclosure apron according to the present disclosure positioned around a
utility enclosure buried
in the ground;
[0025] Fig. 18 is a top perspective view with part of the soil removed to
reveal a cross-section
of the utility enclosure apron of Fig. 17;
[0026] Fig. 19 is a top perspective view of a portion of the utility enclosure
apron of Fig. 17;
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[0027] Fig. 20 is a cross-sectional view of the utility enclosure apron of
Fig. 17 taken along
line 20-20;
[0028] Fig. 21 is a top perspective view of a mold for fabricating the utility
enclosure apron of
the present disclosure,
[0029] Fig. 22 is atop plan view of the mold of Fig. 21;
[0030] Fig. 23 is a cross-sectional view of the mold of Fig. 21 taken along
line 23-23 of Fig.
22; and
[0031] Fig. 24 is a cross-sectional view of the mold of Fig. 21 with polymer
cement poured
into the mold and filler members embedded in the polymer cement.
DETAILED DESCRIPTION
[0032] Exemplary embodiments of the present disclosure may be provided as
improvements to
utility enclosures by providing a precast utility enclosure apron that allows
for water, ice and
debris runoff and protects the utility enclosure apron and the utility
enclosure from impacts,
especially side impacts. According to one exemplary embodiment the utility
enclosure apron
includes a looped member having a top surface, a bottom surface, an outer edge
between the top
surface and the bottom surface, a center opening and an inner edge between the
top surface and
the bottom surface around the center opening. The top surface is a tapered
surface such that a
thickness of the inner edge is greater than a thickness of the outer edge.
[0033] Exemplary embodiments of the present disclosure also provide molds for
fabricating
the utility enclosure aprons. According to one exemplary embodiment the
utility enclosure apron
mold includes a tub and a frame.
[0034] In some embodiments, the utility enclosure apron described herein may
be fabricated
from concrete, such as a durable, corrosive resistant, high strength, low
permeability concrete.
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An example of such a suitable concrete is polymer concrete. In other
embodiments and to
increase the strength of the utility enclosure apron, the apron may be
fabricated from concrete
reinforced with fiberglass sheets embedded in the concrete near, for example,
the top and bottom
surfaces of the utility enclosure apron. In other embodiments, and to decrease
the weight of the
utility enclosure apron, the apron may be fabricated from concrete or
fiberglass reinforced
concrete with lightweight filler members embedded in the apron.
[0035] Referring now to the figures, an exemplary embodiment of a utility
enclosure apron
according to the present disclosure is shown and described. For ease of
description the utility
enclosure apron may be referred to herein as the "apron." The apron 20 is a
looped member
configured to fit around a perimeter of a top portion of a utility enclosure
10 as shown in Figs. 1
and 2. In this exemplary embodiment, the apron is a continuous loop. However,
the loop may
be a split loop that is joined together as shown in Figs. 17-21. The apron 20
serves a number of
purposes. For example, the apron 20 acts as a buffer between the utility
enclosure 10 and
equipment that may impact the side of the utility enclosure, such as a lawn
mower. As another
example, the apron 20 stabilizes the buried utility enclosure by minimizing
disruption to the soil
around the utility enclosure.
[0036] Referring to Figs. 3 and 4, the apron 20 has a top surface 22, a bottom
surface 24, an
outer edge 26 between the top surface and the bottom surface, a center opening
28 and an inner
edge 30 around the center 28 and between the top surface and the bottom
surface. The top
surface 22 is angled or tapered, as seen in Fig 3, sufficient to allow water,
ice and debris to
runoff the apron 20 away from the center 28. The slope of the top surface 22
may be in the range
from about 1/2 of an inch to about 6 inches, where the slope angle "et" may be
between about 3
degrees and about 15 degrees. As an example, the slope of the top surface 22
may be 1 inch
starting from the inner edge 30 and ending at the outer edge 26. Such a slope
would generally
equate to a slope angle "a" of about 6 degrees. To achieve, for example, a 1-
inch slope and
maintain the structural integrity of the apron, the thickness of the inner
edge 30 of the apron 20
may be between about 2 inches and about 8 inches, and the thickness of the
outer edge 26 of the
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apron 20 may be between about 1/2 of an inch and about 7 inches. To
illustrate, if the inner edge
30 of the apron 20 is about 3 inches thick, the outer edge 26 of the apron 20
would be about 2
inches thick.
[0037] To facilitate easier opening of a utility enclosure cover (not shown),
the inner edge 30
of the apron 20 may be angled, e.g., angle (3, such that the center opening 28
is larger at the top
surface 22 of the apron 20 than the center opening at the bottom surface 24 of
the apron. The
angle 13, seen in Fig. 3, may be in the range of between about 1 degree and
about 6 degrees, and
is preferably about 3 degrees.
[0038] Along the top surface 22 of the apron 20 is a skid resistant surface
32, shown in Fig. 4.
The skid resistant surface 32 has a coefficient of friction that is in a range
sufficient to limit
slipping when, for example, walking on or driving over the apron. As a non-
limiting example,
the coefficient of friction may be greater than or equal to about 0.5. The
skid resistant surface
32 may be formed by fabricating the apron in a mold having a rough surface
where the top
surface 22 of the apron 20 is formed. In another exemplary embodiment, the
skid resistant
surface may be a coating, e.g., a textured epoxy polymer coating, applied to
the top surface 22.
[0039] Embedded within the top surface of the apron 20 may be one or more lift
inserts 36
used to facilitate the lifting of the apron 20 using machinery or lifting
systems, such as pulley
systems, when, for example, installing the apron around a utility enclosure or
when removing an
apron 20 previously installed around a utility enclosure. Threaded pulling
eyes (not shown) can
then be inserted into the lift inserts.
[0040] In some embodiments, the apron 20 may be fabricated from solid
concrete. In other
embodiments and to increase the strength of the apron 20, the apron may be
fabricated from
concrete reinforced with fiberglass sheets. The fiberglass sheets may be, for
example, embedded
within the concrete near the top surface 22 and the bottom surface 24 of the
apron 20. The top
perspective view of Fig. 4 and the bottom plan view of Fig. 6, show a solid
apron 20 made from
concrete or fiberglass reinforced concrete. In other embodiments, and to
decrease the weight of
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the apron 20, the apron may be fabricated from concrete or fiberglass
reinforced concrete with
lightweight filler members 44, seen in Figs 7 and 8. The lightweight filler
members include, for
example, foam pads, foam boards, balsa wood, etc. In the embodiment shown in
Figs. 7 and 8,
the lightweight filler members are rigid foam pads or boards. The foam pads or
boards may be
made of a lightweight water resistant material. Examples of such lightweight
water resistant
materials include closed cell PVC foam boards, balsa wood, corrugated
cardboard, cellulose
board, fiberboard, etc. The bottom plan view of Fig. 5 shows an apron 20
having struts 40
forming filler member chambers 42 in which prefabricated filler members 44,
seen in Figs. 7 and
8, are placed, and then concrete is poured into the chambers 42 and over the
filler members 44
embedding the filler members in the concrete. In another embodiment, the
filler members can be
formed by spraying or otherwise depositing a lightweight material, such as PVC
foam, balsa
wood, cardboard, cellulose or fiber into the chambers 42 which then hardens
into the filler
members 44, as shown in Fig. 8. In another embodiment, the filler members 44
may be secured
within the filler member chambers 42 using for example adhesives, without
filling the filler
member chambers 42 with concrete. The number of filler member chambers 42 and
the size of
each filler member chamber may vary depending upon the desired size of the
apron, the desired
weight of the apron, and the desired strength of the apron. For example, the
filler members 44
may have a length L, seen in Fig. 5, ranging between about 8 inches and about
16 inches, a width
W, seen in Fig. 7, ranging between about 8 inches and about 16 inches, and a
thickness T ranging
between about 1/4 of an inch and about 6 inches.
[0041] Preferably, the apron has a compressive strength ranging between about
9,000 psi and
about 15,000 psi, a flexural strength ranging between about 3,000 psi and
about 6,000 psi, a
tensile strength ranging between about 800 psi and about 1,100 psi, so that
the apron 20 can
withstand loads of up to about 22,500 lbs. and can withstand an impact of up
to about 52 Nm.
[00421 As noted above, the present disclosure also contemplates kits for
providing access to
underground equipment, such as underground utility equipment. The kit includes
the utility
enclosure 10 and the apron 20. An example of a utility enclosure 10, shown in
Figs. 1 and 2,
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includes a box 12 and a cover (not shown). The box 12 may be rectangular in
shape, square in
shape or circular in shape. In the embodiment shown, the box 12 is rectangular
in shape and
includes a plurality of walls that include one or more conduit or cable knock-
outs. The walls
may have vertical supporting members providing additional support to the
walls. A rim 14 may
extend around the box 12 along the top edge of the walls forming an opening
for the cover. The
rim 14 may include a ledge 16 upon which the cover rests. The box 12 and cover
may include a
locking mechanism to lock the cover to the box. The box and cover may be made
from one or
more of high density polyethylene (HDPE), concrete, etc.
[0043] Referring now to Figs. 9-16, another exemplary embodiment of a utility
enclosure
apron according to the present disclosure is shown and described. In this
exemplary
embodiment, the utility enclosure 110 includes a box 112 and a cover (not
shown). The box 112
in this exemplary embodiment is circular in shape. The apron 120 is also
looped member, here a
circular loop, configured to fit around a perimeter of a top portion of the
box 112, as shown in
Figs. 9 and 10. In this exemplary embodiment, the apron 120 is a continuous
loop. The apron
120 serves a number of purposes. For example, the apron 120 acts as a buffer
between the utility
enclosure 110 and equipment that may impact the side of the utility enclosure,
such as a lawn
mower. As another example, the apron 120 stabilizes the buried utility
enclosure by minimizing
disruption to the soil around the utility enclosure.
[0044] Referring to Figs. 11 and 12, the apron 120 has a top surface 122, a
bottom surface 124,
an outer edge 126 between the top surface and the bottom surface, a center
opening 128 and an
inner edge 130 around the center opening 128 and between the top surface and
the bottom
surface. The top surface 122 is angled or tapered, as seen in Fig. 11,
sufficient to allow water,
ice and debris to runoff the apron 120 away from the center opening 128. The
slope of the top
surface 122 may be in the range from about 1/2 of an inch to about 6 inches,
where the slope
angle "a" may be, for example, between about 3 degrees and about 15 degrees.
As an example,
the slope of the top surface 122 may be 1 inch starting from the inner edge
130 and ending at the
outer edge 126. Such a slope would generally equate to a slope angle "a" of
about 6 degrees. To
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achieve, for example, a 1-inch slope and maintain the structural integrity of
the apron, the
thickness of the inner edge 130 of the apron 120 may be between about 2 inches
and about 8
inches, and the thickness of the outer edge 126 of the apron 120 may be
between about 1/2 of an
inch and about 7 inches. To illustrate, if the inner edge 130 of the apron 120
is about 3 inches
thick, the outer edge 126 of the apron 120 would be about 2 inches thick.
[0045] To facilitate easier opening of a utility enclosure cover (not shown),
the inner edge 130
of the apron 120 may be angled, e.g., angle p, such that the center opening
128 is larger at the top
surface 122 of the apron 120 than the center opening at the bottom surface 124
of the apron. As
a non-limiting example, the angle [3, seen in Fig. 11, may be in the range of
between about 1
degree and about 6 degrees, and is preferably about 3 degrees.
[0046] Along the top surface 122 of the apron 120 is a skid resistant surface
132, shown in Fig.
12. The skid resistant surface 132 has a coefficient of friction that is in a
range sufficient to limit
slipping when, for example, walking on or driving over the apron. As a non-
limiting example,
the coefficient of friction may be greater than or equal to about 0.5. The
skid resistant surface
132 may be fol tiled by fabricating the apron in a mold having a rough
surface where the top
surface 122 of the apron 120 is formed. In another exemplary embodiment, the
skid resistant
surface may be a coating, e.g., a textured epoxy polymer coating, applied to
the top surface 122.
[0047] Embedded within the top surface of the apron 120 may be one or more
lift inserts 136
used to facilitate the lifting of the apron 120 using machinery or lifting
systems, such as pulley
systems, when, for example, installing the apron around a utility enclosure or
when removing an
apron 120 previously installed around a utility enclosure. Threaded pulling
eyes (not shown) can
then be inserted into the lift inserts.
[0048] In some embodiments, the apron 120 may be fabricated from solid
concrete. In other
embodiments and to increase the strength of the apron 120, the apron may be
fabricated from
concrete reinforced with fiberglass sheets. The fiberglass sheets may be, for
example, embedded
within the concrete near the top surface 122 and the bottom surface 124 of the
apron 120. The
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top perspective view of Fig. 12 and the bottom plan view of Fig. 14 show a
solid apron 120 made
from concrete or fiberglass reinforced concrete. In other embodiments, and to
decrease the
weight of the apron 120, the apron may be fabricated from concrete or
fiberglass reinforced
concrete with lightweight filler members 144, seen in Figs. 10 and 15 The
lightweight filler
members include, for example, foam pads, foam boards, balsa wood, etc. In the
embodiment
shown in Figs. 10 and 15, the lightweight filler members are rigid foam pads
or boards. The
foam pads or boards may be made of a lightweight water resistant material.
Examples of such
lightweight water resistant materials include closed cell PVC foam boards,
balsa wood,
corrugated cardboard, cellulose board, fiberboard, etc. The bottom plan view
of Fig. 13 shows
an apron 120 having struts 140 forming filler member chambers 142 in which
prefabricated filler
members 144, seen in Figs. 15, can be placed, and then concrete is poured into
the chambers 142
and over the filler members 144 embedding the filler members in the concrete.
In another
embodiment, the filler members can be formed by spraying or otherwise
depositing a lightweight
material, such as PVC foam, balsa wood, cardboard, cellulose or fiber into the
chambers 142
which then hardens into the filler members 144. In another embodiment, the
filler members 144
may be secured within the filler member chambers 142 using for example
adhesives, without
filling the filler member chambers 142 with concrete. The number of struts 140
and thus the
number of filler member chambers 142 and the size of each filler member
chamber may vary
depending upon the desired size of the apron, the desired weight of the apron,
and the desired
strength of the apron. For example, the struts 140 may extend between the
outer edge 126 and
the inner edge 130 and positioned radially at predefined intervals, as seen in
Fig. 13. In the
embodiment shown, the struts are positioned at 45 degree intervals resulting
in eight (8) filler
member chambers 142, seen in Fig. 13. Due to the circular shape of the apron
120 in this
exemplary embodiment, the filler member chambers 142 are wedge like shapes
with an outer arc
length A1 and an inner arc length A2. The arc lengths are defined by the
number and position of
the struts 140 and the radius of the circular apron. The thickness T2 of the
filler member
chamber may range, for example, between about 025 inches and about 6 inches.
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[0049] Preferably, the apron 120 has a compressive strength ranging between
about 9,000 psi
and about 15,000 psi, a flexural strength ranging between about 3,000 psi and
about 6,000 psi, a
tensile strength ranging between about 800 psi and about 1,100 psi, so that
the apron can
withstand loads of up to about 22,500 lbs and can withstand an impact of up to
about 52 Nm.
[0050] As noted above, the present disclosure also contemplates kits for
providing access to
underground equipment, such as underground utility equipment. In this
exemplary embodiment,
the kit includes the utility enclosure 110 and the apron 120. An example of a
utility enclosure
110, shown in Figs. 9 and 10, includes a box 12 and a cover (not shown). In
this exemplary
embodiment, the box 112 is circular in shape and includes a continuous wall
that may include
one or more conduit or cable knock-outs. The wall may have vertical supporting
members
providing additional support to the wall. A rim 114 may extend around the box
112 along the
top edge of the wall forming an opening for the cover. The rim 114 may include
a ledge 116
upon which the cover rests. The box 112 and cover may include a locking
mechanism to lock
the cover to the box. The box and cover may be made from one or more of high
density
polyethylene (HDPE), concrete, etc.
[0051] Referring now to Figs. 17-21, another exemplary embodiment of the apron
according to
the present disclosure is shown. In this exemplary embodiment, the utility
enclosure 110 is the
same as the utility enclosure described above and for ease of description is
not repeated. The
apron 220 is also looped member, here a circular loop, configured to fit
around a perimeter of a
top portion of the box 212, as shown in Figs. 17 and 18. The apron 220 is
substantially similar to
the apron 120, except that the apron is a split apron having a first apron
portion 222 and a second
apron portion 224. The first apron portion 222 has a first end 222a and a
second end 222b, and
the second apron portion 224 has a first end 224a and a second end 224b. In
this exemplary
embodiment, the first end 222a of the first apron portion 222 has a notch 226
and one or more
inserts 228 embedded within the notch and accessible from a top surface of the
notch, as shown
in Fig. 19. The one or more inserts 228 are configured to receive a fastener,
such as a threaded
bolt, and are used to secure the first apron portion 222 to the second apron
portion 224. The first
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end 224a of the second apron portion 224 has a notched overhang 230 that mates
with the notch
228 in the first end 222a of the first apron portion 222. The notched overhang
230 includes one
or more mounting apertures 232 used to secure the first end 224a of the second
apron portion to
the first end 222a of the first apron portion 222. Preferably, the mounting
apertures 232 are
countersunk so that fastener used to secure the apron portions together is
recessed within the
mounting aperture. The second end 222b of the first apron portion 222 and the
second end 224b
of the second apron portion 224 would be configured the same as the first
apron portion 222.
[0052] To secure the first apron portion 222 to the second apron portion 224,
the notch
overhang 230 of the first end 224a of the second end portion 224 is mated with
the first end 222a
of the first apron portion 222. One or more threaded bolts 234 and one or more
corresponding
washers 236 are inserted into the one or more mounting apertures 232, as shown
in Fig. 19, and
the bolts extend through the notched overhang 230. The bolts 234 are then
threaded into the
inserts 228 embedded in the notch 226 in the first end 222a of the first apron
portion 222 and
tightened, as seen in Fig. 20.
[0053] Similar to the embodiments of Figs. 9-16, the apron 220 may be
fabricated from, for
example, solid concrete, concrete reinforced with fiberglass sheets, concrete
with lightweight
filler members 144, or fiberglass reinforced concrete with lightweight filler
members 144. In
embodiments where the filler members are used, the number of struts 140 and
thus the number of
filler member chambers 142 and the size of each filler member chamber may vary
depending
upon the desired size of the apron portions, the desired weight of the apron
portions, and the
desired strength of the apron portions, similar to that described above.
[0054] As noted above, the present disclosure also contemplates kits for
providing access to
underground equipment, such as underground utility equipment. In this
exemplary embodiment,
the kit includes the utility enclosure 110 and the apron 220 described above.
[0055] Turning now to Figs. 21-24, an exemplary embodiment of a mold 50 for
fabricating the
apron 20 of the present disclosure is shown. In this embodiment, the mold is a
top-down mold
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where the top surface 22 of the apron 20 is formed by the mold. The mold 50
has a tub 52 that
rests within a frame 70, seen in Fig. 21. The tub 52 has a support member 54,
a recess 56 and a
center rib 58. The support member 54 has a ledge 60, seen in Fig. 23, which
extends around the
perimeter of the support member 54 The ledge 60 is configured to rest on the
frame 70, as seen
in Figs. 23 and 24. The support member 54 has a wall 62 that forms the outer
edge 26 of the
apron 20, seen in Figs. 1 and 4. The center rib 58 forms the center opening 28
of the apron 20
and includes a wall 64 that forms the inner edge 30 of the apron 20. A face
56a of the recess 56
forms the top surface 22 of the apron 20. The face 56a of the mold 50 may be
formed with a
rough surface to impart the skid resistant surface 32 on the top surface of
the apron 20. As seen
in Fig. 23, the face 56a of the recess 56 is tapered so that the width of the
recess is at its greatest
at the wall 64 of the center rib 58, and so that the width of the recess is
narrower at the wall 62 of
the support member 54. The tapered face 56a of the recess 56 is tapered to
form the tapered
shape in the top surface 22 of the apron 20 that facilitates water, ice and
debris runoff. To create
openings to fit the lift inserts 36 in the apron 20 described above, the
center of the recess 56 may
include one or more plugs 66, seen in Fig. 22. In this exemplary embodiment of
a top-down
mold 50, once concrete is poured into the recess, a bull float, screed or
trowel can be used to
level the concrete relative to the support member 54 and center rib 58 to form
the bottom surface
24 of the apron, which is typically flat. The mold 50 according to the present
disclosure can be
fabricated from a composite material that includes a tooling gel coat surface,
a tooling resin and
chopped fiberglass strands.
[0056] The frame 70 of the mold 50 can be made of any suitable material
sufficient to support
the mold 50 and the weight of the concrete forming the apron 20. For example,
the frame can be
made of hollow steel tubing or bars that may be square, rectangular or round
in shape. In this
exemplary embodiment, the frame 70 includes a rectangular tub support 72 that
is secured to a
grid shaped base 74, as shown.
[0057] To precast a concrete apron 20, concrete is poured into the recess 56
of the mold 50
until the concrete fills the recess. Excess concrete is removed using a bull
float, screed or trowel
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and the concrete is leveled relative to the support member 54 and center rib
58 to form the
bottom surface 24 of the apron. The concrete is then allowed, for example, to
set for about 0.25
hours at which time the apron can be removed from the mold 50
[0058] To precast a fiberglass reinforced concrete apron 20, a layer, e.g.,
about 1/8 of an inch
thick, of concrete is poured into the recess 56 of the mold 50. A fiberglass
sheet is then laid on
the concrete and additional concrete is poured into the mold covering the
fiberglass sheet until
about a 1/8 inch remains before the recess is filled with concrete. A second
fiberglass sheet is
then laid on the concrete and additional concrete is poured into the mold 50
covering the
fiberglass sheet until the concrete fills the recess 56. Excess concrete is
removed using a bull
float, screed or trowel and the concrete is leveled relative to the support
member 54 and center
rib 58 to form the bottom surface 24 of the apron. The concrete is then
allowed, for example, to
set for about 0.25 hours at which time the apron can be removed from the mold.
[0059] To precast a lightweight fiberglass reinforced concrete apron 20, a
layer, e.g., about 1/8
of an inch thick, of concrete is poured into the recess 56 of the mold 50. A
fiberglass sheet is
then laid on the concrete and additional concrete is poured into the mold
covering the fiberglass
sheet until about 1/8 of an inch remains before the recess is filled with
concrete. One or more
filler members 44, e.g., one or more lightweight foam pads or blocks, are then
positioned in the
recess 56 on the concrete. Additional concrete is poured into the recess until
the concrete covers
the filler members and fills the recess 56. Excess concrete is removed using a
bull float, screed
or trowel and the concrete is leveled relative to the support member 54 and
center rib 58 to form
the bottom surface 24 of the apron. The concrete is then allowed, for example,
to set for about
0.25 hours at which time the apron can be removed from the mold.
[0060] While the mold and method for fabricating the apron according to the
present
disclosure is shown and described with reference to apron shape of Fig. 1, one
skilled in the are
would readily appreciate the type, configuration and size of a mold needed to
fabricate the other
embodiments of the apron described herein and those also contemplated by the
present
disclosure. Further, while illustrative embodiments of the present disclosure
have been described
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and illustrated above, it should be understood that these are exemplary of the
disclosure and are
not to be considered as limiting Additions, deletions, substitutions, and
other modifications can
be made without departing from the spirit or scope of the present disclosure
Accordingly, the
present disclosure is not to be considered as limited by the foregoing
description
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